#include <gtkmm.h>

#include "display/sp-canvas-util.h"

#include "helper/sp-marshal.h"

#include "display/canvas-arena.h"

#include "display/cairo-utils.h"

#include "display/drawing-context.h"

#include "display/drawing-item.h"

#include "display/drawing-group.h"

#include "display/drawing-surface.h"

#include "preferences.h"

using namespace Inkscape;

enum {

ARENA_EVENT,

LAST_SIGNAL

};

static void sp_canvas_arena_destroy(SPCanvasItem *object);

static void sp_canvas_arena_item_deleted(SPCanvasArena *arena, Inkscape::DrawingItem *item);

static void sp_canvas_arena_update (SPCanvasItem *item, Geom::Affine const &affine, unsigned int flags);

static void sp_canvas_arena_render (SPCanvasItem *item, SPCanvasBuf *buf);

static double sp_canvas_arena_point (SPCanvasItem *item, Geom::Point p, SPCanvasItem **actual_item);

static void sp_canvas_arena_viewbox_changed (SPCanvasItem *item, Geom::IntRect const &new_area);

static gint sp_canvas_arena_event (SPCanvasItem *item, GdkEvent *event);

static gint sp_canvas_arena_send_event (SPCanvasArena *arena, GdkEvent *event);

static void sp_canvas_arena_request_update (SPCanvasArena *ca, DrawingItem *item);

static void sp_canvas_arena_request_render (SPCanvasArena *ca, Geom::IntRect const &area);

static guint signals[LAST_SIGNAL] = {0};

struct CachePrefObserver : public Inkscape::Preferences::Observer {

CachePrefObserver(SPCanvasArena *arena)

: Inkscape::Preferences::Observer("/options/renderingcache")

, _arena(arena)

{

Inkscape::Preferences *prefs = Inkscape::Preferences::get();

std::vector<Inkscape::Preferences::Entry> v = prefs->getAllEntries(observed_path);

for (unsigned i=0; i<v.size(); ++i) {

notify(v[i]);

}

prefs->addObserver(*this);

}

void notify(Preferences::Entry const &v) {

Glib::ustring name = v.getEntryName();

if (name == "size") {

_arena->drawing.setCacheBudget((1 << 20) * v.getIntLimited(64, 0, 4096));

}

}

SPCanvasArena *_arena;

};

G_DEFINE_TYPE(SPCanvasArena, sp_canvas_arena, SP_TYPE_CANVAS_ITEM);

static void

sp_canvas_arena_class_init (SPCanvasArenaClass *klass)

{

SPCanvasItemClass *item_class = (SPCanvasItemClass *) klass;

signals[ARENA_EVENT] = g_signal_new ("arena_event",

G_TYPE_FROM_CLASS(item_class),

G_SIGNAL_RUN_LAST,

((glong)((guint8*)&(klass->arena_event) - (guint8*)klass)),

NULL, NULL,

sp_marshal_INT__POINTER_POINTER,

G_TYPE_INT, 2, G_TYPE_POINTER, G_TYPE_POINTER);

item_class->destroy = sp_canvas_arena_destroy;

item_class->update = sp_canvas_arena_update;

item_class->render = sp_canvas_arena_render;

item_class->point = sp_canvas_arena_point;

item_class->event = sp_canvas_arena_event;

item_class->viewbox_changed = sp_canvas_arena_viewbox_changed;

}

static void

sp_canvas_arena_init (SPCanvasArena *arena)

{

arena->sticky = FALSE;

new (&arena->drawing) Inkscape::Drawing(arena);

Inkscape::DrawingGroup *root = new DrawingGroup(arena->drawing);

root->setPickChildren(true);

arena->drawing.setRoot(root);

arena->observer = new CachePrefObserver(arena);

arena->drawing.signal_request_update.connect(

sigc::bind<0>(

sigc::ptr_fun(&sp_canvas_arena_request_update),

arena));

arena->drawing.signal_request_render.connect(

sigc::bind<0>(

sigc::ptr_fun(&sp_canvas_arena_request_render),

arena));

arena->drawing.signal_item_deleted.connect(

sigc::bind<0>(

sigc::ptr_fun(&sp_canvas_arena_item_deleted),

arena));

arena->active = NULL;

}

static void sp_canvas_arena_destroy(SPCanvasItem *object)

{

SPCanvasArena *arena = SP_CANVAS_ARENA(object);

delete arena->observer;

arena->drawing.~Drawing();

if (SP_CANVAS_ITEM_CLASS(sp_canvas_arena_parent_class)->destroy)

SP_CANVAS_ITEM_CLASS(sp_canvas_arena_parent_class)->destroy(object);

}

static void

sp_canvas_arena_update (SPCanvasItem *item, Geom::Affine const &affine, unsigned int flags)

{

SPCanvasArena *arena = SP_CANVAS_ARENA (item);

if (SP_CANVAS_ITEM_CLASS(sp_canvas_arena_parent_class)->update)

SP_CANVAS_ITEM_CLASS(sp_canvas_arena_parent_class)->update(item, affine, flags);

arena->ctx.ctm = affine;

unsigned reset = flags & SP_CANVAS_UPDATE_AFFINE ? DrawingItem::STATE_ALL : 0;

arena->drawing.update(Geom::IntRect::infinite(), arena->ctx, DrawingItem::STATE_ALL, reset);

Geom::OptIntRect b = arena->drawing.root()->visualBounds();

if (b) {

item->x1 = b->left() - 1;

item->y1 = b->top() - 1;

item->x2 = b->right() + 1;

item->y2 = b->bottom() + 1;

}

if (arena->cursor) {

/* Mess with enter/leave notifiers */

DrawingItem *new_arena = arena->drawing.pick(arena->c, arena->drawing.delta, arena->sticky);

if (new_arena != arena->active) {

GdkEventCrossing ec;

ec.window = gtk_widget_get_window (GTK_WIDGET (item->canvas));

ec.send_event = TRUE;

ec.subwindow = ec.window;

ec.time = GDK_CURRENT_TIME;

ec.x = arena->c[Geom::X];

ec.y = arena->c[Geom::Y];

/* fixme: */

if (arena->active) {

ec.type = GDK_LEAVE_NOTIFY;

sp_canvas_arena_send_event (arena, (GdkEvent *) &ec);

}

arena->active = new_arena;

if (arena->active) {

ec.type = GDK_ENTER_NOTIFY;

sp_canvas_arena_send_event (arena, (GdkEvent *) &ec);

}

}

}

}

static void

sp_canvas_arena_item_deleted(SPCanvasArena *arena, Inkscape::DrawingItem *item)

{

if (arena->active == item) {

arena->active = NULL;

}

}

static void

sp_canvas_arena_render (SPCanvasItem *item, SPCanvasBuf *buf)

{

// todo: handle NR_ARENA_ITEM_RENDER_NO_CACHE

SPCanvasArena *arena = SP_CANVAS_ARENA (item);

Geom::OptIntRect r = buf->rect;

if (!r || r->hasZeroArea()) return;

Inkscape::DrawingContext dc(buf->ct, r->min());

arena->drawing.update(Geom::IntRect::infinite(), arena->ctx);

arena->drawing.render(dc, *r);

}

static double

sp_canvas_arena_point (SPCanvasItem *item, Geom::Point p, SPCanvasItem **actual_item)

{

SPCanvasArena *arena = SP_CANVAS_ARENA (item);

arena->drawing.update(Geom::IntRect::infinite(), arena->ctx, DrawingItem::STATE_PICK | DrawingItem::STATE_BBOX);

DrawingItem *picked = arena->drawing.pick(p, arena->drawing.delta, arena->sticky);

arena->picked = picked;

if (picked) {

*actual_item = item;

return 0.0;

}

return 1e18;

}

static void

sp_canvas_arena_viewbox_changed (SPCanvasItem *item, Geom::IntRect const &new_area)

{

SPCanvasArena *arena = SP_CANVAS_ARENA(item);

// make the cache limit larger than screen to facilitate smooth scrolling

Geom::IntRect expanded = new_area;

Geom::IntPoint expansion(new_area.width()/2, new_area.height()/2);

expanded.expandBy(expansion);

arena->drawing.setCacheLimit(expanded);

}

static gint

sp_canvas_arena_event (SPCanvasItem *item, GdkEvent *event)

{

Inkscape::DrawingItem *new_arena;

/* fixme: This sucks, we have to handle enter/leave notifiers */

SPCanvasArena *arena = SP_CANVAS_ARENA (item);

gint ret = FALSE;

switch (event->type) {

case GDK_ENTER_NOTIFY:

if (!arena->cursor) {

if (arena->active) {

//g_warning ("Cursor entered to arena with already active item");

}

arena->cursor = TRUE;

/* TODO ... event -> arena transform? */

arena->c = Geom::Point(event->crossing.x, event->crossing.y);

/* fixme: Not sure abut this, but seems the right thing (Lauris) */

arena->drawing.update(Geom::IntRect::infinite(), arena->ctx,

DrawingItem::STATE_PICK | DrawingItem::STATE_BBOX, 0);

arena->active = arena->drawing.pick(arena->c, arena->drawing.delta, arena->sticky);

ret = sp_canvas_arena_send_event (arena, event);

}

break;

case GDK_LEAVE_NOTIFY:

if (arena->cursor) {

ret = sp_canvas_arena_send_event (arena, event);

arena->active = NULL;

arena->cursor = FALSE;

}

break;

case GDK_MOTION_NOTIFY:

/* TODO ... event -> arena transform? */

arena->c = Geom::Point(event->motion.x, event->motion.y);

/* fixme: Not sure abut this, but seems the right thing (Lauris) */

arena->drawing.update(Geom::IntRect::infinite(), arena->ctx,

DrawingItem::STATE_PICK | DrawingItem::STATE_BBOX);

new_arena = arena->drawing.pick(arena->c, arena->drawing.delta, arena->sticky);

if (new_arena != arena->active) {

GdkEventCrossing ec;

ec.window = event->motion.window;

ec.send_event = event->motion.send_event;

ec.subwindow = event->motion.window;

ec.time = event->motion.time;

ec.x = event->motion.x;

ec.y = event->motion.y;

/* fixme: */

if (arena->active) {

ec.type = GDK_LEAVE_NOTIFY;

ret = sp_canvas_arena_send_event (arena, (GdkEvent *) &ec);

}

arena->active = new_arena;

if (arena->active) {

ec.type = GDK_ENTER_NOTIFY;

ret = sp_canvas_arena_send_event (arena, (GdkEvent *) &ec);

}

}

ret = ret || sp_canvas_arena_send_event (arena, event);

break;

case GDK_SCROLL: {

Inkscape::Preferences *prefs = Inkscape::Preferences::get();

bool wheelzooms = prefs->getBool("/options/wheelzooms/value");

bool ctrl = (event->scroll.state & GDK_CONTROL_MASK);

if ((ctrl && !wheelzooms) || (!ctrl && wheelzooms)) {

/* Zoom is emitted by the canvas as well, ignore here */

return FALSE;

}

ret = sp_canvas_arena_send_event (arena, event);

break;

}

default:

/* Just send event */

ret = sp_canvas_arena_send_event (arena, event);

break;

}

return ret;

}

static gint

sp_canvas_arena_send_event (SPCanvasArena *arena, GdkEvent *event)

{

gint ret = FALSE;

/* Send event to arena */

g_signal_emit (G_OBJECT (arena), signals[ARENA_EVENT], 0, arena->active, event, &ret);

return ret;

}

static void

sp_canvas_arena_request_update (SPCanvasArena *ca, DrawingItem */*item*/)

{

sp_canvas_item_request_update (SP_CANVAS_ITEM (ca));

}

static void sp_canvas_arena_request_render(SPCanvasArena *ca, Geom::IntRect const &area)

{

SPCanvas *canvas = SP_CANVAS_ITEM(ca)->canvas;

canvas->requestRedraw(area.left(), area.top(), area.right(), area.bottom());

}

sp_canvas_arena_set_pick_delta (SPCanvasArena *ca, gdouble delta)

{

g_return_if_fail (ca != NULL);

g_return_if_fail (SP_IS_CANVAS_ARENA (ca));

/* fixme: repick? */

ca->delta = delta;

}

sp_canvas_arena_set_sticky (SPCanvasArena *ca, gboolean sticky)

{

g_return_if_fail (ca != NULL);

g_return_if_fail (SP_IS_CANVAS_ARENA (ca));

/* fixme: repick? */

ca->sticky = sticky;

}

sp_canvas_arena_render_surface (SPCanvasArena *ca, cairo_surface_t *surface, Geom::IntRect const &r)

{

g_return_if_fail (ca != NULL);

g_return_if_fail (SP_IS_CANVAS_ARENA (ca));

Inkscape::DrawingContext dc(surface, r.min());

ca->drawing.update(Geom::IntRect::infinite(), ca->ctx);

ca->drawing.render(dc, r);

}